of kingsport



Patented May 30, 1933 UNITED STATES PATENT oFFrcE FRED F. SHETTERLY, OF KINGSPORT, TENNESSEE, ASSIGNOR TO BLUE RIDGE GLASS CORPORATION, OF KINGSPORT, TENNESSEE, A CORPORATION OF NEW- YORK METHOD OF AND MEANS FOR BEDDING GLASS FOR WORKING N0 Drawing. Application filed June 13,

In an application filed February 4, 1929, by Tommy-Martin and Loupe, Serial No. 337,428, a method of bedding glass for grinding and polishing is described, which comprises the use of bleached soda pulp as a material in which glass may be bedded on grinding and polishing tables. It has been observed that when'a polished surface of a plate is so bedded on such pulp, certain de fects have developed which mar the previously perfect surface. My investigations have shown that these defects are due to alkalies in the pulp attacking, under the pressures and temperature developed in the grinding or polishing operation, the surface of the glass. I have discovered that these defects can be avoided by treating the pulp, prior to the use thereof as a bedding material, with an acid, by which the alkali is neutralized. My invention, therefore, consists both in the process of preparing and using the pulp and the pulp ready for bedding, as will be hereinafter described and claimed.

In carrying out my invention, I take pulp in sheet form, commercially known as bleached soda pulp, and after laying on the grinding or polishing tables, thoroughly wet it, preferably by a spray of-an acid solution. After it is so wetted, the glass sheets to be operated on are laid on the wetted paper.

I preferably employ hydrochloric acid in making up the acid solution, and while I t have found that complete neutralization can be obtained by 0.144 cc. of commercial hydrochloric acid per square foot of pulp sheet, it is advisable to use about six times as much acid, so that the sheet has a distinctly acid reaction, as I have further found sheets of bedding on a neutral pulp develop after a time defects traceable to the use of the pulp.

Having thus described my invention, what I claim is 1- 1. The hereinbefore described process of 1930. Serial No. 461,055.

able bed, rendering the pulp acid by wetting it with an acid solution, and bedding on the wet sheet the glass to be worked.

In testimony whereof I hereunto aflix my signature.

FRED F. SHETTERLY. 

